Universally-gradable suspension-insulator.



S. S. SONNEBORN. UNIVERSALLY GHADABLE SUSPENSION INSULATOR.

APPLICATION FILED AUG-25,1917.

Patented Jan. 14, 1919.

5] wvewtoz 060m J0/ AIL/ 01? soL s. SONNEBORN, or BROOKLYN, NEW YORK.

UNIVERSALLY- GRADABLE SUSPENSION-INSULATOR.

Specification of Letters Patent.

Patented -Ian.14, 1919.

Application filed August 25, 1917. Serial No. 188,236.

insulator formed of a string of a plurality of high tension suspension insulator units, connected in series so that the insulating power of each unit will be added to that of each other unit in the string. In practice it has been found to be difficult uniformly to divide the full potential of the line across each insulator unit. This difiiculty is partly due to the fact that the normal potential across each insulator is proportional to capacity current rather than to leakage current when the leakage currents are relatively small. The above is on the hypothesis that all the insulator units are identical. What is known as grading has been resorted to more uniformly to distribute and divide the potential across the individual insulator units by varying the electro-static capacity of the various individual insulator units. This method of grading has necessitated that the. different insulator units of a string be physically different one from another, giving rise to the disadvantage of non-interchangeability of parts and the necessity of carrying onhand for repairs a number of each of the different distinct insulator units rather than a number of insulator units all alike, any one of which could be used for repair of any one of the insulator units of a string or complete suspension insulator.

Heretofore, in my application for patent Serial No. 147,736, filed Feb. 10, 1917, for adjustable suspension insulator, I have described how I can accomplish grading in a string of identical units by varying the relative positioning of the units in the string and by providing means for this purpose.

The object of the present invention is still further to improve my method of producing grading in a string of identical insulator units, which I accomplish b tion, in various localities of the string, of substantially indestructible parts, such as metallic hoods or canopies, and other forms of arcing members such as disks and members providing radially extending spokes or horns. Either without varying the positioning of the insulator units of the string or with varying the positioning of the units of a string, vI effect grading by adjustably positioning such devices as the aforementioned arcing members. The above and further objects of the invention will better be understood by reference to the illustrative embodiment set forth in the following specification and claims, which should be read in connection with the drawings .which form a part hereof, and in which the single figure is a vertical elevation, with parts shown in vertical section, of an illustrative embodiment of a suspension insulator in accordance with my invention.

The insulating power of the insulator is provided through the medium of a plurality of any desired number of insulator units T, T and T,-Which are preferably of the type described in detail in my aforementioned copending application, in which the shanks 21, 25 and 32'are axially adjustable relatively to the units T, T and T respectively. In addition to the insulator units which are supported in adjustable positions from the cross arm 1 through the medium of a bolt 2, swiveled to the unit T by the bolt 3, I provide one or more radially extensive members of conducting material A, B, C, D. In

the illustrative embodiment the members A,

B, C, D are all different, but I desire it to be understood that I contemplate the employment of a plurality of any one of the individual forms A, B, C, D, or any combination of the same.

The embodiment A is a hood or canopy of sheet metal, supported by a hub 10, tapped to be adjustably threaded onto the shank of the bolt 2 and locked in adjustable position by the lock nut 11. The embodiment B has a hub 20 tapped to be adjustably threaded on the bolt shank 21 between the units T and T, and locked in position by the lock nut 22, and is provided with a plurality of equally spaced radially projecting arms 23-, each terminating in an uptilted, pointed tip 24. It is suggested that eight arms is an appropriate number.

the interposi- ,The member 0 is merely a disk of sheet metal positioned upon the bolt shank 25 between the units T and T" throng dium of two nuts 26 and 27, jamm ng against is swiveled to the bolt the medium of the fork for various positlons along a transmission line, and that the spaclng of the insulator units and the-positioning of the arcing members be determined in accordance with these altitude measurements, and in accordance with any and all other special conditions which have an effect upon grading. The arcing members, when they are in the form of the hood A, serve also the function of an efiicient weather shield, and they may all be employed for the function of distributing electro-static stress, which is particularly true of the hood and disk types shown in the embodiments A andG. All o'f the arcing members are serviceable in adjusting the string so that the arcing values both for rainy and dry weather may be made equal.

What is claimed and what is desired to be secured by United States Letters Patent v 1s:-

1. A high-potential insulator adjustable in its electrical functions, comprising a plurality of insulator-units, connected in series;

and one or more arcing members of conducting material bodily adjustably mounted coaxially of said series of insulator-unlts.

high-potential insulator adjustable in its electrical functions, comprising a series adjustable of identical insulator-units having axially connecting means; and one or more arcing members-of conducting material h the meline wire 35, clamped in a.

adjustably mounted coaxially of saidseries' 5 0- of insulator-units.

3. A high-potential insulator adjustable in its electrical functions, comprising a series of insulator-units having end terminals; and

1 an arcing member bodily adjustably mountedon the end terminals of-said series. a

4. A high-potential insulator adjustable in its electrical functions, comprising a series of insulator-units having end terminals; one or, more arcing members of conducting material each bodily adjustably mounted between two adjacent insulator-units; and an arcing member bodily adjustably mounted on the end terminals of said series.

f 5. A high-potential insulator comprising a series of insulator units; a plurality of threaded connecting bolts mutually connecting said units between a support and a line conductor; and one or more arcing members having hubs in threaded adjustable engagement with said bolts.

6. A high-potentialinsulator com rising a series of insulator units; a plura ity of threaded connecting bolts mutually connecting said units between a support and a line conductor; a metallic hood adjustably mounted on one of said bolts between said support andan insulator unit; and one or more arcing members having hubs in threaded adjustable engagement with said olts. A

7. In combination in a high-potential in sulator "chain, a plurality of insulator units having one or more axially adjustable connecting means; and a laterally extensive conducting member bodily axially adjustable V and mounted on a "said connecting means, whereby a ready adjustment of capacity may be eifected- 8. A high-potential insulator having unsymmetrical metallic terminals in combination with a bodily axially adjustable laterally extensive conducting member in electrical connection with one of said terminals of said insulator, whereby capacity may be adjustably varied.

Aug. 14, 1917.

SOL. S. SONNEBORN. 

